[Experimental Framework] Move trial token code to renderer

content/child/origin_trials/trial_token_validator.h

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONTENT_CHILD_ORIGIN_TRIALS_TRIAL_TOKEN_VALIDATOR_H_
-#define CONTENT_CHILD_ORIGIN_TRIALS_TRIAL_TOKEN_VALIDATOR_H_
-
-#include <string>
-#include "third_party/WebKit/public/platform/WebTrialTokenValidator.h"
-
-namespace content {
-
-// The TrialTokenValidator is called by the Experimental Framework code in Blink
-// to validate tokens to enable experimental features.
-//
-// This class is thread-safe.
-class TrialTokenValidator : public blink::WebTrialTokenValidator {
- public:
-  TrialTokenValidator();
-  ~TrialTokenValidator() override;
-
-  // blink::WebTrialTokenValidator implementation
-  bool validateToken(const blink::WebString& token,
-                     const blink::WebString& origin,
-                     const blink::WebString& featureName) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(TrialTokenValidator);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_ORIGIN_TRIALS_TRIAL_TOKEN_VALIDATOR_H_